Bed



FIG. 1 is a perspective view of an embodiment of a bed showing my new design;

FIG. 2 is a top view thereof:

FIG. 3 is a front elevation view thereof; and,

FIG. 4 is a left side elevational view (right side elevational view is a mirror image thereof).

The broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a bed, as shown and described. 